1. Reason: The white problem of guppy may be caused by bacterial infection. When the breeder accidentally scratches their skin while fishing, or bumps into sharp objects while swimming, it will cause injuries. If the guppy is not treated in time after injury, it will be infected, and it is easy to have long white hair after wound infection.

2. Treatment: Breeders need to slowly raise the temperature of their water, which can reduce the activity of bacteria. Then give them a medicated bath with methyl blue or malachite green solution, once a day for 20-30 minutes each time, and finally apply yellow powder to their wounds, which can speed up their recovery.

1. Reason: The white problem of guppy fish is also called water mold, which is mainly caused by water mold invading fish. When they grow in poor water quality, they will be infected with water mold. The obvious symptom in the early stage of water mold is that the body is covered with white hair.

2. Treatment: Water mold is contagious to some extent. After the breeder finds that the guppy is sick, he needs to isolate the sick fish first, so as to prevent them from being transmitted to other fish. Then raise the water temperature to 28 ℃, and then turn on the oxygen pump to keep the dissolved oxygen in the water sufficient. Finally, the breeder gives them a medicated bath with potassium permanganate solution once a day for about 20-30 minutes each time. In about a week, the white hair can be alleviated.